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r/2-1=-4
We move all terms to the left:
r/2-1-(-4)=0
We add all the numbers together, and all the variables
r/2+3=0
We multiply all the terms by the denominator
r+3*2=0
We add all the numbers together, and all the variables
r+6=0
We move all terms containing r to the left, all other terms to the right
r=-6
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